Win any combination of 3 events in a row, i.e. Heat X -> Dash -> B Main, Heat X -> Dash -> A Feature.
Qualifying will not count for this achievement, but I do advise it. If you qualify in first, then you will start in fourth in Heat 1. Win this Heat, head on to the Dash and win it, and finally win the A Feature and you will get the achievement.
Doing challenges (like the accuracy challenges), does NOT break your consecutive win chain. You could win the Dash and A Feature of the first event at Volusia, then go on and win the Heat you qualify into at the 2nd event as well as the Dash and A Feature, and finally win a Heat from the 2rd event and get your achievement.